GRE

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Author:
chellen12
ID:
51723
Filename:
GRE
Updated:
2010-11-26 00:35:30
Tags:
equations
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Description:
math equations
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  1. area of triangle
    1/2 base x height
  2. pythagorean theorem

    only for right triangles
    a2 + b2 = c2
  3. right triangle ratios

    (4)
    • 3:4:5
    • 5:12:13
    • s : s : s/2
    • s : s/3 : 2s
  4. area of square

    (2)
    • s2
    • 1/2 d2 d=diagonal
  5. area of rhombus, 4 equal sides, 4 angles that aren't necessary right angles
    1/2 d1 d2
  6. area of parallelogram

    2 opposite and equal pairs of sides
    base x height
  7. area of rapezoid
    1/2 (b1 + b2) x h
  8. total interior angle
    (n-2) 180

    n=number of sides
  9. average measure of one angle in polygon
    (n-2)180 / n
  10. volume of polygon
    area of the base x height
  11. volume of a cylinder
    (pie r2) height
  12. total surface area of a cube
    6e2
  13. total surface area of rectangular solid
    2(l w) + 2 (w h) + 2 (h l)
  14. total surface area of a cylinder
    (circumference x height) + 2(pie r2)
  15. distance between 2 points
    / (x2 - x1)2 + (y2 - y1)2
  16. circumference of circle
    2pie r

    pie d
  17. area of circle
    pie r2
  18. length of an arc
    • 1. find the circumference of the circle (2pie r, pie d)
    • 2. put the degree measure* of the arc over 360, reduce fraction
    • 3. multiply circumference by the fraction
  19. area of a sector
    • 1. find area of the circle (r2)
    • 2 . put degree measure* of sector over 360, reduce
    • 3. multiply the area by the fraction
  20. equations for FOIL
    • (a+b)2 = a2 + 2ab + b2
    • (a-b)2 = a2 - 2ab + b2
    • (a-b)(a+b) = a2 - b2
  21. find probability
    number of possible desired outcomes/ number of total possible outcomes
  22. find distance
    • distance = rate x time
    • time = distance/ rate
    • etc
  23. average
    sum/ number of terms
  24. average common sense way

    average is 90
    numbers: 89, 88, 93, 92 90
    -1, -2, +3, +2

    • = +2
    • need to get 88 to get average (subtract the number extra or add number needed)
  25. percent increase or decrease
    number increase or decrease/ original whole
  26. interest problems
    • PRTI
    • Principal x Rate x Time = Interest

    • principal:amount money begin with
    • rate: interest rate you're earning on the money, expressed as a decimal
    • time: amt of time (years) money left in account
    • interest: amt of interest earn on the investment
  27. work
    time put in/ capacity, time to do the whole job

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